3.0 on a 1200 in the mid 90's before switching to Windows for Workgroups. Ran various Windows machines until the mid 2000's, where I went Mac OSX and back to the Amiga. This time, it was AOS3.9 though and ran that all the way through to 2009. Now I'm back to AOS3.1 on my main Amiga - the 3000.